@article{MS2_1971__29_166191,
     author = {C.J.A., Jr. Halberg and A. Samuelsson},
     title = {On the {Fine} {Structure} of {Spectra.}},
     journal = {Mathematica Scandinavica},
     pages = {37--49},
     publisher = {mathdoc},
     volume = {29},
     year = {1971},
     zbl = {0236.47006},
     url = {http://geodesic.mathdoc.fr/item/MS2_1971__29_166191/}
}